linux-kernel - perf bench unexpected behaviour

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Message-ID: <1348244001.1660.14.camel@castor.rsk>
Date:	Fri, 21 Sep 2012 17:13:21 +0100
From:	Richard Kennedy <richard@....demon.co.uk>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: perf bench unexpected behaviour

Hi all,
If I run
	perf bench --format=simple all > test.out

I get this line repeated hundreds of times in test.out

	# Running sched/messaging benchmark...

interleaved with the useful output.
It's only printed once if I call it from the command line, it just
redirecting to a file that does odd things. 

AFAICT the message is only printed once, so any ideas why it does this? 
and is there anything I can do to stop it?

This is on 3.6-rc*, I haven't tried any earlier kernels.

thanks
Richard


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